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A new symbiotic association Sagartiogeton undatus (Müller) - Pagurus excavatus (Herbst) is described from the Egean Sea (Eastern Mediterranean). Although not very significative of the circalittoral zone where the association Calliactis parasitica (Couch) - Pagurus excavatus (Herbst) is prevailing, it may be considered as characteristic of the bathyal zone where the average pagurid biomass is reduced. Allometric analyses have shown that the adaptation of the population of the small-sized pagurids is not due to a high social status of some pagurids but to an autoprotective behaviour against predation.